Add ability to filter `winget list` and `winget search` commands by install scope (user/machine)

[IDisposable]

Relevant area(s)

WinGet CLI

Description of the new feature / enhancement

It would be wonderful to be able to filter the list and search commands to restrict to packages that were (for list) or can-be (for search) installed specifically as a user or machine package.

Proposed technical implementation details

Add a --Scope command line parameter to the WinGet CLI in ListCommand.cpp and SearchCommand.cpp. Use the preexisting Execution::Args::Type::InstallScope enumeration (which is already used and validated in the install command).